2004 GX, non-NAV. 175,000 miles.
I'm having an issue that I can't seem to figure out: Starting this last spring, whenever the HVAC is put in a/c mode, several of the actuators have begun to make noise - I mean, it's like Geppetto's workshop noises behind the dash, and it'll run you crazy! I have isolated the noises to the following 3: (a) the actuator behind the glovebox that controls the fresh/recirculating air damper, (b) the actuator below / right of the radio that controls air temp. blending, and (c) the actuator that selects HVAC mode. These things click and carry on so much that I honestly can't drive the truck until the weather turns cold (for some reason, none of the actuators make noise with the HVAC in heat mode.......!) Oh, and if I leave the mode in fresh vs recirc. air, that one will generally stay quiet.
My thinking is, the likelihood of 3 actuators going out simultaneously is highly unlikely; therefore, my thinking is that whatever module that controls the HVAC is the most likely culprit. My primary problem is: I can't seem to run down where the HVAC computer/module/whatever-it's-called is located. I presume the truck probably has some sort of stand-alone module that controls the HVAC system, but I just can't find any diagrams that lead me to it.
It's been suggested that all of the HVAC is controlled by the HVAC "head unit" in the dash, but I don't want to start replacing things like that until I'm reasonably sure that's where the control module resides.
Anyway, that's a general explanation of what's going on. Anyone have any thoughts / suggestions?
Thanks,
David
I'm having an issue that I can't seem to figure out: Starting this last spring, whenever the HVAC is put in a/c mode, several of the actuators have begun to make noise - I mean, it's like Geppetto's workshop noises behind the dash, and it'll run you crazy! I have isolated the noises to the following 3: (a) the actuator behind the glovebox that controls the fresh/recirculating air damper, (b) the actuator below / right of the radio that controls air temp. blending, and (c) the actuator that selects HVAC mode. These things click and carry on so much that I honestly can't drive the truck until the weather turns cold (for some reason, none of the actuators make noise with the HVAC in heat mode.......!) Oh, and if I leave the mode in fresh vs recirc. air, that one will generally stay quiet.
My thinking is, the likelihood of 3 actuators going out simultaneously is highly unlikely; therefore, my thinking is that whatever module that controls the HVAC is the most likely culprit. My primary problem is: I can't seem to run down where the HVAC computer/module/whatever-it's-called is located. I presume the truck probably has some sort of stand-alone module that controls the HVAC system, but I just can't find any diagrams that lead me to it.
It's been suggested that all of the HVAC is controlled by the HVAC "head unit" in the dash, but I don't want to start replacing things like that until I'm reasonably sure that's where the control module resides.
Anyway, that's a general explanation of what's going on. Anyone have any thoughts / suggestions?
Thanks,
David